USDA says SNAP benefits won't be issued on Nov. 1

As the impacts of the government shutdown continue to get worse by the day, Senate Minority Leader Chuck Schumer told ABC News the responsibility is on Republicans to negotiate and not on Democrats to vote for a clean extension.

ABC News Capitol Hill Correspondent Jay O'Brien Schumer on SNAP food assistance, a lifeline for millions of Americans that several states are warning won’t be available as of Nov. 1.

"Are Democrats, at least in part, to blame for some of that pain because you are the ones holding out?" O'Brien asked the Senate's top Democrat.

"No," Schumer said. "We have a very simple request, sit there and negotiate. The American people are aghast. Any observer, objective observer, is against that here on this serious problem, they won't even negotiate with us. The onus is on them to sit down. But that is why we have urged Hakeem and I have urged Trump to sit down with us and seriously negotiate."

Senate Majority Leader John Thune, following Trump's lunch with Republican senators at the White House, said the president is "prepared to sit down" with Democrats to talk about healthcare (specifically Obamacare subsidies) but only once the government shutdown ends.

"Before that can happen, we've got to have five Democrats who have a little backbone and a willingness to take on their leadership and do the right thing for the country," Thune said.

Thune said Republicans were a "united team" and "at some point, Democrats are going to have to take yes for an answer."

"We’re hopeful that this will be the week when we break out of this and Democrats come to their senses and decide to open up the government,” Thune said. "We're going to give them several opportunities, as you know, to do that. We'll have another vote on the continuing resolution tomorrow."

Speaking to Senate Republicans gathered at the White House Rose Garden, President Donald Trump delivered a message as the government shutdown officially enters its third week.

"I want to just say from the beginning, our message has been very simple. We will not be extorted on this crazy plot of theirs. They've never done this before. Nobody has. You always vote for an extension. Chuck Schumer and the Senate Democrats need to vote for the clean bipartisan CR and reopen our government," Trump said, prompting applause from the GOP lawmakers in attendance.

"They are the obstructionists," Trump said.

Republican senators will be at the White House on Tuesday afternoon for lunch in the Rose Garden with President Donald Trump. It's unclear what's on the agenda, but it comes as the party continues to pressure Democrats to reopen the government.

On Capitol Hill, the House remains out of session, and there is currently no vote scheduled in the Senate on a short-term funding bill.

-ABC News' Justin Gomez